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Chin. Phys. B, 2009, Vol. 18(12): 5385    DOI: 10.1088/1674-1056/18/12/044
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Study of runaway electron behaviour during electron cyclotron resonance heating in the HL-2A Tokamak

Zhang Yi-Po, Yang Jin-Wei, Liu Yi, Song Xian-Ying, Yuan Guo-Liang, Li Xu, Zhou Yan, Zhou Jun, Yang Qing-Wei, Chen Liao-Yuan, Rao Jun, Duan Xu-Ru, Pan Chuan-Hong, HL-2A Team
Southwestern Institute of Physics, P O Box 432, Chengdu 610041, China
Abstract  During the current flat-top phase of electron cyclotron resonance heating discharges in the HL-2A Tokamak, the behaviour of runaway electrons has been studied by means of hard x-ray detectors and neutron diagnostics. During electron cyclotron resonance heating, it can be found that both hard x-ray radiation intensity and neutron emission flux fall rapidly to a very low level, which suggests that runaway electrons have been suppressed by electron cyclotron resonance heating. From the set of discharges studied in the present experiments, it has also been observed that the efficiency of runaway suppression by electron cyclotron resonance heating was apparently affected by two factors: electron cyclotron resonance heating power and duration. These results have been analysed by using a test particle model. The decrease of the toroidal electric field due to electron cyclotron resonance heating results in a rapid fall in the runaway electron energy that may lead to a suppression of runaway electrons. During electron cyclotron resonance heating with different powers and durations, the runaway electrons will experience different slowing down processes. These different decay processes are the major cause for influencing the efficiency of runaway suppression. This result is related to the safe operation of the Tokamak and may bring an effective control of runaway electrons.
Keywords:  electron cyclotron resonance heating      runaway suppression      suppression efficiency      runaway electron     
Received:  01 April 2009      Published:  20 December 2009
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  28.52.Cx (Fueling, heating and ignition)  
  28.52.Lf (Components and instrumentation)  
  52.50.Sw (Plasma heating by microwaves; ECR, LH, collisional heating)  
  52.70.La (X-ray and γ-ray measurements)  
  52.70.Nc (Particle measurements)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10675124, 10775041 and 10775045).

Cite this article: 

Zhang Yi-Po, Yang Jin-Wei, Liu Yi, Song Xian-Ying, Yuan Guo-Liang, Li Xu, Zhou Yan, Zhou Jun, Yang Qing-Wei, Chen Liao-Yuan, Rao Jun, Duan Xu-Ru, Pan Chuan-Hong, HL-2A Team Study of runaway electron behaviour during electron cyclotron resonance heating in the HL-2A Tokamak 2009 Chin. Phys. B 18 5385

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